Well, I just drove home and tested a few things with my recently flashed 5.5. The bluetooth seems fine. I did have to manually pair it the first time, but reconnects automatically now. GPS is the same it was on b3. A good quick lock while standing still but worthless for navigation.
I havent had a whole lot of time to test the battery but so far, I took it off the charger about 8am yesterday. Last night when I went to bed it was like 78% woke up it was about 72%. When I flashed it this morning it was at 64%, now at 330pm im at 38% and I have messed with it alot today before during and after the flash, well see what happens after a full charge tonight. That was with Wifi always on, beautiful widgets, email, twitter, and longitude updating every hour.
BTW, if you are having issues with the Cog. betas let DG know so he/they can check it out and fix it in future releases.